# \#mjf **URL:** https://amtpostpro.discourse.group/tag/mjf/1.md [Latest](https://amtpostpro.discourse.group/latest.md) · [Categories](https://amtpostpro.discourse.group/categories.md) · [Tags](https://amtpostpro.discourse.group/tags.md) --- ## [Case study: Protolabs, flame-retardant parts with UL94 V-0 compliance](https://amtpostpro.discourse.group/t/case-study-protolabs-flame-retardant-parts-with-ul94-v-0-compliance/72)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:26am UTC](https://amtpostpro.discourse.group/t/case-study-protolabs-flame-retardant-parts-with-ul94-v-0-compliance/72 "2026-10-07T11:26:13Z")
Published by AMT, June 2026. Read the full case study. Protolabs produces flame-retardant parts in HP 3D HR PA 12 FR on HP MJF and vapor smooths them. The case study reports improved surface quality, reduced surface por… --- ## [Case study: Norden replaces a machined assembly with one smoothed part](https://amtpostpro.discourse.group/t/case-study-norden-replaces-a-machined-assembly-with-one-smoothed-part/71)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:26am UTC](https://amtpostpro.discourse.group/t/case-study-norden-replaces-a-machined-assembly-with-one-smoothed-part/71 "2026-10-07T11:26:12Z")
Published by AMT, November 2025. Read the full case study. Norden replaced a multi-component, machined assembly in its production machinery with a single HP MJF part with internal vacuum channels, vapor smoothed. The ca… --- ## [Case study: ABConcept rally parts through the Rallye du Maroc](https://amtpostpro.discourse.group/t/case-study-abconcept-rally-parts-through-the-rallye-du-maroc/69)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:26am UTC](https://amtpostpro.discourse.group/t/case-study-abconcept-rally-parts-through-the-rallye-du-maroc/69 "2026-10-07T11:26:12Z")
Published by AMT, December 2025. Read the full case study. ABConcept ran over 100 vapor smoothed HP MJF PA12 components through more than 2,450 km of the Rallye du Maroc. The case study looks at how vapor smoothing help… --- ## [Case study: GM spoiler closeout seals, 60,000 vapor smoothed TPU parts](https://amtpostpro.discourse.group/t/case-study-gm-spoiler-closeout-seals-60-000-vapor-smoothed-tpu-parts/68)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:26am UTC](https://amtpostpro.discourse.group/t/case-study-gm-spoiler-closeout-seals-60-000-vapor-smoothed-tpu-parts/68 "2026-10-07T11:26:11Z")
Published by AMT, January 2023. Read the full case study. For its 2022 full-size SUVs, GM needed 60,000 spoiler closeout seals, and needed them quickly or risk delaying 30,000 vehicles. The parts were printed on HP MJF … --- ## [Case study: Point Designs, partial hand prostheses smoothed on a PostPro SFX](https://amtpostpro.discourse.group/t/case-study-point-designs-partial-hand-prostheses-smoothed-on-a-postpro-sfx/67)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:26am UTC](https://amtpostpro.discourse.group/t/case-study-point-designs-partial-hand-prostheses-smoothed-on-a-postpro-sfx/67 "2026-10-07T11:26:11Z")
Published by AMT, July 2026. Read the full case study. Point Designs designs 3D printed partial hand prostheses, printed on HP MJF and vapor smoothed on a PostPro SFX. The case study’s title sums up the goal: prostheses… --- ## [AMT gallery: before and after vapor smoothing](https://amtpostpro.discourse.group/t/amt-gallery-before-and-after-vapor-smoothing/65)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:26am UTC](https://amtpostpro.discourse.group/t/amt-gallery-before-and-after-vapor-smoothing/65 "2026-10-07T11:26:10Z")
To get this category started, here are four pairs from AMT’s own published images. Each pair shows the same part as printed (left) and after PostPro vapor smoothing (right). Lattice bicycle saddle, MJF TPU Shown … --- ## [Vapor smoothing polypropylene: the FA9202 consumable](https://amtpostpro.discourse.group/t/vapor-smoothing-polypropylene-the-fa9202-consumable/57)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:25am UTC](https://amtpostpro.discourse.group/t/vapor-smoothing-polypropylene-the-fa9202-consumable/57 "2026-10-07T11:25:50Z")
Polypropylene does not smooth with the same consumable as the polyamides. As AMT’s product pages put it, “polypropylene is smoothed with a dedicated consumable”. That consumable is FA9202. What AMT publishes for FA9202 … --- ## [Vapor smoothing TPU and other elastomers: what AMT has published](https://amtpostpro.discourse.group/t/vapor-smoothing-tpu-and-other-elastomers-what-amt-has-published/56)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:25am UTC](https://amtpostpro.discourse.group/t/vapor-smoothing-tpu-and-other-elastomers-what-amt-has-published/56 "2026-10-07T11:25:49Z")
Flexible parts make some of the most striking vapor smoothing examples: lattices, seals, grips and wearables. Compatibility TPU is listed as compatible on all four PostPro systems (SFX, SF2X, SF50 and SF100). PostPro P… --- ## [Vapor smoothing PA12: what AMT has published](https://amtpostpro.discourse.group/t/vapor-smoothing-pa12-what-amt-has-published/54)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:25am UTC](https://amtpostpro.discourse.group/t/vapor-smoothing-pa12-what-amt-has-published/54 "2026-10-07T11:25:49Z")
PA12 is one of the most widely printed powder bed materials. It is listed as compatible on all four PostPro systems (SFX, SF2X, SF50 and SF100), with PostPro Pure and with FA326. Published results on PA12 Material a… --- ## [Dyeing and vapor smoothing: which comes first?](https://amtpostpro.discourse.group/t/dyeing-and-vapor-smoothing-which-comes-first/48)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:25am UTC](https://amtpostpro.discourse.group/t/dyeing-and-vapor-smoothing-which-comes-first/48 "2026-10-07T11:25:46Z")
Many smoothed parts are also colored, and the order of operations is one of the most common questions we hear. AMT does not publish a single rule, because the right order depends on the material, the dye process and the … --- ## [Thin walls and lattices: what to check](https://amtpostpro.discourse.group/t/thin-walls-and-lattices-what-to-check/46)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:25am UTC](https://amtpostpro.discourse.group/t/thin-walls-and-lattices-what-to-check/46 "2026-10-07T11:25:45Z")
Lattices and thin-walled parts show off vapor smoothing well: lots of surface, often in flexible materials, and hard to finish any other way. AMT’s vapor smoothing page calls out complex geometries with intricate feature… --- ## [Designing internal channels for vapor smoothing](https://amtpostpro.discourse.group/t/designing-internal-channels-for-vapor-smoothing/44)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:25am UTC](https://amtpostpro.discourse.group/t/designing-internal-channels-for-vapor-smoothing/44 "2026-10-07T11:25:44Z")
Internal channels are one of the best reasons to vapor smooth. The process seals internal surfaces as well as external ones: the SF2X page says it “also seals internal cavities”. AMT’s systems run under vacuum, which let… --- ## [Share your best racking setup for TPU lattices](https://amtpostpro.discourse.group/t/share-your-best-racking-setup-for-tpu-lattices/41)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:25am UTC](https://amtpostpro.discourse.group/t/share-your-best-racking-setup-for-tpu-lattices/41 "2026-10-07T11:25:43Z")
TPU lattices are some of the most striking parts to come out of a vapor smoothing cycle. AMT’s own examples include the lattice bicycle saddle on the vapor smoothing page (captioned MJF TPU), and two published projects i… --- ## [Before your first cycle: which printer technologies can be vapor smoothed?](https://amtpostpro.discourse.group/t/before-your-first-cycle-which-printer-technologies-can-be-vapor-smoothed/39)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:25am UTC](https://amtpostpro.discourse.group/t/before-your-first-cycle-which-printer-technologies-can-be-vapor-smoothed/39 "2026-10-07T11:25:42Z")
Short answer: parts from the common powder bed processes, plus some extrusion-printed and machined plastics. The detail depends on the machine and the consumable. What AMT publishes By machine (product pages): Mach… --- ## [Depowder thoroughly before smoothing, and why it matters](https://amtpostpro.discourse.group/t/depowder-thoroughly-before-smoothing-and-why-it-matters/38)
**Author:** [@amtpostpro](https://amtpostpro.discourse.group/u/amtpostpro)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 11:25am UTC](https://amtpostpro.discourse.group/t/depowder-thoroughly-before-smoothing-and-why-it-matters/38 "2026-10-07T11:25:41Z")
Vapor smoothing works on the surface the vapor can reach. As AMT’s vapor smoothing page puts it, the vapor “condenses on the part’s surface, eliminating peaks and troughs”. Whatever is on that surface when the cycle star…